Why does this page align to the left...?

If you head out to http://www.echoframe.com/Cart/home.php, you'll notice that on a Windows platform (IE7), the page is centered. In Firefox and Safari, the page aligns itself in the upper left hand corner.

You can view the source code of the page (please also look at http://echoframe.com/Cart/index.php) to see how things are coded on the page itself. I also have a portion of the stylesheet documented below.

Bottom line: I need consistency in both platforms. I'm confident I've overlooked some protocol somewhere which is why Firefox and Safari are not behaving. What am I missing?

/**
 * Main CSS Stylesheet
 *
 * @package templateSystem
 * @copyright Copyright 2003-2005 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: stylesheet.css 5347 2006-12-22 20:26:09Z birdbrain $
 */
 
body {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 12px;
        line-height: 16px;
        color: #121111;
        text-align: left;
        vertical-align: top;
        padding: 0px;
        height: 100%;
        width: 100%;
        margin: 0;
	background-color: #f8f8f8;
}
 
.footer {
        FONT-SIZE:8pt;
            COLOR: #000066;
           FONT-FAMILY: Microsoft Sans Serif, Helvetica, 'Times New Roman';
          font-weight:normal;
 
}
 
 
td.background {
        background-image: url(http://echoframe.com/Cart/images/ZenCartBackground.jpg);
        background-repeat: no-repeat;
        background-position: center top;
        background-color: #f8f8f8;
         text-align: center;
}

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